Pain Under Chest And Back When Breathing. Pneumothorax is a collapse of part or all of a lung which can trigger severe chest pain and shortness of breath. It can occur in one or both lungs.
The pain from pericarditis may also be felt as pain in the left shoulder back. Pericarditis causes sharp chest pain. Pneumonia is an infection that causes the lung s tiny air sacs to fill with fluid.
This pain may become worse while breathing deeply lying down or swallowing.
Pain in the upper back when breathing usually extends around the chest. This pain may become worse while breathing deeply lying down or swallowing. Pain in the upper back when breathing usually extends around the chest. Pneumothorax is a common complication of emphysema and other lungs diseases.